CVE-2025-59060 Overview
A hostname verification bypass vulnerability has been identified in Apache Ranger's NiFiRegistryClient and NiFiClient components. This security flaw affects Apache Ranger versions 2.7.0 and earlier, allowing potential attackers to bypass hostname verification during SSL/TLS certificate validation. When hostname verification is bypassed, an attacker could potentially intercept or manipulate communications between Apache Ranger and NiFi Registry or NiFi instances.
Critical Impact
This vulnerability enables network-based attackers to bypass hostname verification, potentially facilitating man-in-the-middle attacks against Apache Ranger deployments communicating with NiFi components.
Affected Products
- Apache Ranger versions <= 2.7.0
- Apache Ranger NiFiRegistryClient component
- Apache Ranger NiFiClient component
Discovery Timeline
- 2026-03-03 - CVE CVE-2025-59060 published to NVD
- 2026-03-05 - Last updated in NVD database
Technical Details for CVE-2025-59060
Vulnerability Analysis
This vulnerability is classified as CWE-297 (Improper Validation of Certificate with Host Mismatch), which occurs when a certificate's hostname does not match the expected hostname for the server being connected to, but the connection is established anyway without proper verification.
In the context of Apache Ranger, the NiFiRegistryClient and NiFiClient components are used to communicate with Apache NiFi and NiFi Registry services. When these clients establish TLS connections, they fail to properly verify that the hostname in the server's certificate matches the intended target server. This improper certificate validation creates an opportunity for attackers positioned on the network path to impersonate legitimate NiFi or NiFi Registry servers.
The vulnerability is exploitable over the network without requiring any authentication or user interaction, although the impact is limited to potential information disclosure of data transmitted during these communications.
Root Cause
The root cause of this vulnerability lies in improper implementation of SSL/TLS hostname verification within the NiFiRegistryClient and NiFiClient classes. The affected code either disables hostname verification entirely or implements a custom hostname verifier that accepts any hostname regardless of what the server certificate specifies.
This type of vulnerability commonly occurs when developers disable hostname verification during development or testing and fail to re-enable it for production, or when custom SSL context configurations are implemented without proper hostname verification callbacks.
Attack Vector
The attack vector for CVE-2025-59060 is network-based. An attacker must be able to position themselves between the Apache Ranger server and the NiFi or NiFi Registry services—typically through ARP spoofing, DNS hijacking, or by controlling network infrastructure.
Once positioned, the attacker can present any valid SSL certificate (even one for a completely different domain) and the vulnerable Apache Ranger clients will accept it, allowing the attacker to intercept communications. This could expose sensitive configuration data, policy information, or credentials being exchanged between Apache Ranger and NiFi components.
The attack does not require authentication or user interaction, making it relatively straightforward to exploit for attackers with network access. However, the positioned nature of the attack limits its exploitability compared to direct remote attacks.
Detection Methods for CVE-2025-59060
Indicators of Compromise
- Unexpected SSL certificate warnings or errors in Apache Ranger logs when connecting to NiFi components
- Network traffic analysis showing connections to NiFi/NiFi Registry endpoints being routed through unexpected IP addresses
- Certificate chain anomalies in TLS handshakes between Ranger and NiFi services
- Suspicious ARP or DNS activity on networks hosting Apache Ranger deployments
Detection Strategies
- Monitor Apache Ranger logs for SSL/TLS connection events to NiFi and NiFi Registry endpoints
- Implement network monitoring to detect potential man-in-the-middle positioning attacks (ARP spoofing, DNS hijacking)
- Deploy certificate transparency monitoring for certificates associated with your NiFi infrastructure
- Use SentinelOne Singularity Platform to detect anomalous network behavior and potential MITM attacks
Monitoring Recommendations
- Enable detailed SSL/TLS logging in Apache Ranger configuration to capture certificate validation events
- Implement network segmentation and monitoring between Apache Ranger and NiFi components
- Configure alerting for any certificate validation failures or warnings in Ranger client connections
- Regularly audit network paths between Ranger and NiFi services for unauthorized intermediary devices
How to Mitigate CVE-2025-59060
Immediate Actions Required
- Upgrade Apache Ranger to version 2.8.0 or later, which contains the fix for this vulnerability
- Review network architecture to ensure secure communication paths between Apache Ranger and NiFi/NiFi Registry services
- Implement network-level protections such as IPsec or VPN tunnels for Ranger-to-NiFi communications as a defense-in-depth measure
- Audit existing Apache Ranger deployments to identify instances running vulnerable versions
Patch Information
Apache has released version 2.8.0 of Apache Ranger, which addresses this hostname verification bypass issue. Users running Apache Ranger versions 2.7.0 or earlier are strongly recommended to upgrade to version 2.8.0 or later. For detailed information about the security fix and upgrade instructions, refer to the Apache Security Mailing List Post and the OpenWall OSS-Security Update.
Workarounds
- Implement mutual TLS (mTLS) authentication between Apache Ranger and NiFi components to add an additional layer of verification
- Use network segmentation and firewall rules to restrict access to NiFi and NiFi Registry endpoints to only authorized Apache Ranger servers
- Deploy network-level encryption (IPsec) between Ranger and NiFi services to protect traffic even if application-level TLS is compromised
- Consider using a reverse proxy with proper certificate validation in front of NiFi services as an intermediary security layer
# Configuration example - Verify Apache Ranger version
# Check current version to determine if upgrade is needed
cd /opt/ranger
./ranger-admin version
# After upgrading to 2.8.0, verify the fix is in place
# Review SSL configuration in ranger-admin-site.xml
grep -i "ssl\|hostname\|verify" /etc/ranger/admin/conf/ranger-admin-site.xml
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
